In Which of the Following Ways Did the Constitution Help

In which of the following ways did the Constitution help enable future anti-slavery efforts?

A) The Constitution made it impossible for the condition of bondage to remain attached to a person after escaping to a state where slavery had been abolished.
B) The Constitution included a slave trade clause that officially ended the importation of slaves immediately upon the signing of the Constitution.
C) By treating slavery as solely an economic issue, the Constitution provided the federal government the right to regulate it as "interstate commerce."
D) By allowing slavery to remain a state-based institution, the Constitution permitted the national government to limit its spread into the western territories.
E) The Constitution granted the federal government the right to tax slaves as property, thus making them less profitable to their owners.